Fam. 6. Asplanchnidae: _Asplanchna_ G., _Asplanchnopus_ De Guerne, (?) _Ascomorpha_, Perty, (?) _Dinops_ Western. ORDER V. SCIRTOPODA.—Females of conical shape, with the body prolonged into hollow limb-like expansions (see p. 201) moved by strong muscles, and ending in branched setose fins like the limbs of Crustacea. Disc as in Bdelloids, but not retractile. Foot represented by two subventral toes, ciliated, inconstant or absent. Trophi malleoramate. Eyes two, latero-ventral, on the disc. Male (Fig. 107, 8) conical, with simple setae. Fam. 7. Pedalionidae: _Pedalion_ H. (Fig. 117),[272] _Hexarthra_ Schmarda.[273] ORDER VI. PLOIMA.—Free-swimming forms, more rarely parasites, often adherent by their trophi to a host. Disc variable, often bearing within the cingulum a number of lobes fringed with coarse compound cilia. Foot rarely absent, marked off by a sharp constriction. Mastax variable, rarely malleoramate, never incudate or uncinate. Intestine not blind. Males small.[274] SUB-ORDER A. ILLORICATA.—Ploima with a soft flexible integument; disc variable; ciliated auricles sometimes present (Synchaetidae, Notommatidae); foot rarely absent; trophi usually malleate. {224}Fam. 8. Microcodonidae: _Microcodon_ E., _Microcodides_ Bergendal. Fam. 9. Rhinopidae: _Rhinops_ H. Fam. 10. Hydatinidae: _Hydatina_ E. (Fig. 106), _Notops_ H., _Hudsonella_ Zach., _Cyrtonia_ Rouss. Fam. 11. Synchaetidae: _Synchaeta_ E. Fam. 12. Notommatidae: _Notommata_ E., _Pleurotrocha_ E., _Copeus_ G., _Proales_ G., _Furcularia_ G., _Eosphora_ G., _Triophthalmus_ E., _Diglena_ E. (Fig. 113), _Distemma_ E., _Triphylus_ E., _Taphrocampa_ G., _Albertia_ Duj., _Balatro_ Clap. Fam. 13. Drilophagidae: _Drilophagus_ Vejdovsky. Fam. 14. Triarthridae: _Triarthra_ E., _Polyarthra_ E., _Pteroessa_ G., _Pedetes_ G. [Illustration: FIG. 117.—_Pedalion mirum_, female. (After Hudson.) A, Ventral view; B, side view. _a_, Median antenna; _al_, antero-lateral limb; _an_, anus; _ci_, cingulum; _dl_, dorso-median limb; _e_, eye; _f_, ciliated pedal processes; _l_, lip; _m_, mouth; _pl_, postero-lateral limb; _tr_, trochus; _vl_, ventro-median limb.]